I think back to Basic Training day. CS gas causes everything to leak from the neck up. Not pleasant. But you survive.
That’s what I’ve heard but never been near the stuff. Maybe you could watch a minute or so from this point where you can see something emitting smoke or ? and tell me - if this was tear gas, couldn’t it be affecting those people closest to it? And wouldn’t the police need to be wearing gas masks as they are advancing right into it?
https://youtu.be/UrMoqSPZym0?t=1682